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net: s2io: simplify logical constraint
[deliverable/linux.git] / drivers / scsi / fnic / fnic_trace.c
CommitLineData
4d7007b4
HP		 1/*
2 * Copyright 2012 Cisco Systems, Inc. All rights reserved.
3 *
4 * This program is free software; you may redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; version 2 of the License.
7 *
8 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
9 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
10 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
11 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
12 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
13 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
14 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
15 * SOFTWARE.
16 */
17
18#include <linux/module.h>
19#include <linux/mempool.h>
20#include <linux/errno.h>
21#include <linux/spinlock.h>
22#include <linux/kallsyms.h>
abb14148 23#include <linux/time.h>
d6472302 24#include <linux/vmalloc.h>
4d7007b4
HP		 25#include "fnic_io.h"
26#include "fnic.h"
27
28unsigned int trace_max_pages;
29static int fnic_max_trace_entries;
30
31static unsigned long fnic_trace_buf_p;
32static DEFINE_SPINLOCK(fnic_trace_lock);
33
34static fnic_trace_dbg_t fnic_trace_entries;
35int fnic_tracing_enabled = 1;
36
abb14148
HS		 37/* static char *fnic_fc_ctlr_trace_buf_p; */
38
39static int fc_trace_max_entries;
40static unsigned long fnic_fc_ctlr_trace_buf_p;
41static fnic_trace_dbg_t fc_trace_entries;
42int fnic_fc_tracing_enabled = 1;
43int fnic_fc_trace_cleared = 1;
44static DEFINE_SPINLOCK(fnic_fc_trace_lock);
45
46
4d7007b4
HP		 47/*
48 * fnic_trace_get_buf - Give buffer pointer to user to fill up trace information
49 *
50 * Description:
51 * This routine gets next available trace buffer entry location @wr_idx
52 * from allocated trace buffer pages and give that memory location
53 * to user to store the trace information.
54 *
55 * Return Value:
56 * This routine returns pointer to next available trace entry
57 * @fnic_buf_head for user to fill trace information.
58 */
59fnic_trace_data_t *fnic_trace_get_buf(void)
60{
61 unsigned long fnic_buf_head;
62 unsigned long flags;
63
64 spin_lock_irqsave(&fnic_trace_lock, flags);
65
66 /*
67 * Get next available memory location for writing trace information
68 * at @wr_idx and increment @wr_idx
69 */
70 fnic_buf_head =
71 fnic_trace_entries.page_offset[fnic_trace_entries.wr_idx];
72 fnic_trace_entries.wr_idx++;
73
74 /*
75 * Verify if trace buffer is full then change wd_idx to
76 * start from zero
77 */
78 if (fnic_trace_entries.wr_idx >= fnic_max_trace_entries)
79 fnic_trace_entries.wr_idx = 0;
80
81 /*
82 * Verify if write index @wr_idx and read index @rd_idx are same then
83 * increment @rd_idx to move to next entry in trace buffer
84 */
85 if (fnic_trace_entries.wr_idx == fnic_trace_entries.rd_idx) {
86 fnic_trace_entries.rd_idx++;
87 if (fnic_trace_entries.rd_idx >= fnic_max_trace_entries)
88 fnic_trace_entries.rd_idx = 0;
89 }
90 spin_unlock_irqrestore(&fnic_trace_lock, flags);
91 return (fnic_trace_data_t *)fnic_buf_head;
92}
93
94/*
95 * fnic_get_trace_data - Copy trace buffer to a memory file
96 * @fnic_dbgfs_t: pointer to debugfs trace buffer
97 *
98 * Description:
99 * This routine gathers the fnic trace debugfs data from the fnic_trace_data_t
100 * buffer and dumps it to fnic_dbgfs_t. It will start at the rd_idx entry in
101 * the log and process the log until the end of the buffer. Then it will gather
102 * from the beginning of the log and process until the current entry @wr_idx.
103 *
104 * Return Value:
105 * This routine returns the amount of bytes that were dumped into fnic_dbgfs_t
106 */
107int fnic_get_trace_data(fnic_dbgfs_t *fnic_dbgfs_prt)
108{
109 int rd_idx;
110 int wr_idx;
111 int len = 0;
112 unsigned long flags;
113 char str[KSYM_SYMBOL_LEN];
114 struct timespec val;
115 fnic_trace_data_t *tbp;
116
117 spin_lock_irqsave(&fnic_trace_lock, flags);
118 rd_idx = fnic_trace_entries.rd_idx;
119 wr_idx = fnic_trace_entries.wr_idx;
120 if (wr_idx < rd_idx) {
121 while (1) {
122 /* Start from read index @rd_idx */
123 tbp = (fnic_trace_data_t *)
124 fnic_trace_entries.page_offset[rd_idx];
125 if (!tbp) {
126 spin_unlock_irqrestore(&fnic_trace_lock, flags);
127 return 0;
128 }
129 /* Convert function pointer to function name */
130 if (sizeof(unsigned long) < 8) {
131 sprint_symbol(str, tbp->fnaddr.low);
132 jiffies_to_timespec(tbp->timestamp.low, &val);
133 } else {
134 sprint_symbol(str, tbp->fnaddr.val);
135 jiffies_to_timespec(tbp->timestamp.val, &val);
136 }
137 /*
138 * Dump trace buffer entry to memory file
139 * and increment read index @rd_idx
140 */
141 len += snprintf(fnic_dbgfs_prt->buffer + len,
142 (trace_max_pages * PAGE_SIZE * 3) - len,
143 "%16lu.%16lu %-50s %8x %8x %16llx %16llx "
144 "%16llx %16llx %16llx\n", val.tv_sec,
145 val.tv_nsec, str, tbp->host_no, tbp->tag,
146 tbp->data[0], tbp->data[1], tbp->data[2],
147 tbp->data[3], tbp->data[4]);
148 rd_idx++;
149 /*
150 * If rd_idx is reached to maximum trace entries
151 * then move rd_idx to zero
152 */
153 if (rd_idx > (fnic_max_trace_entries-1))
154 rd_idx = 0;
155 /*
156 * Continure dumpping trace buffer entries into
157 * memory file till rd_idx reaches write index
158 */
159 if (rd_idx == wr_idx)
160 break;
161 }
162 } else if (wr_idx > rd_idx) {
163 while (1) {
164 /* Start from read index @rd_idx */
165 tbp = (fnic_trace_data_t *)
166 fnic_trace_entries.page_offset[rd_idx];
167 if (!tbp) {
168 spin_unlock_irqrestore(&fnic_trace_lock, flags);
169 return 0;
170 }
171 /* Convert function pointer to function name */
172 if (sizeof(unsigned long) < 8) {
173 sprint_symbol(str, tbp->fnaddr.low);
174 jiffies_to_timespec(tbp->timestamp.low, &val);
175 } else {
176 sprint_symbol(str, tbp->fnaddr.val);
177 jiffies_to_timespec(tbp->timestamp.val, &val);
178 }
179 /*
180 * Dump trace buffer entry to memory file
181 * and increment read index @rd_idx
182 */
183 len += snprintf(fnic_dbgfs_prt->buffer + len,
184 (trace_max_pages * PAGE_SIZE * 3) - len,
185 "%16lu.%16lu %-50s %8x %8x %16llx %16llx "
186 "%16llx %16llx %16llx\n", val.tv_sec,
187 val.tv_nsec, str, tbp->host_no, tbp->tag,
188 tbp->data[0], tbp->data[1], tbp->data[2],
189 tbp->data[3], tbp->data[4]);
190 rd_idx++;
191 /*
192 * Continue dumpping trace buffer entries into
193 * memory file till rd_idx reaches write index
194 */
195 if (rd_idx == wr_idx)
196 break;
197 }
198 }
199 spin_unlock_irqrestore(&fnic_trace_lock, flags);
200 return len;
201}
202
67125b02
HP		 203/*
204 * fnic_get_stats_data - Copy fnic stats buffer to a memory file
205 * @fnic_dbgfs_t: pointer to debugfs fnic stats buffer
206 *
207 * Description:
208 * This routine gathers the fnic stats debugfs data from the fnic_stats struct
209 * and dumps it to stats_debug_info.
210 *
211 * Return Value:
212 * This routine returns the amount of bytes that were dumped into
213 * stats_debug_info
214 */
215int fnic_get_stats_data(struct stats_debug_info *debug,
216 struct fnic_stats *stats)
217{
218 int len = 0;
219 int buf_size = debug->buf_size;
220 struct timespec val1, val2;
221
222 len = snprintf(debug->debug_buffer + len, buf_size - len,
223 "------------------------------------------\n"
224 "\t\tIO Statistics\n"
225 "------------------------------------------\n");
226 len += snprintf(debug->debug_buffer + len, buf_size - len,
227 "Number of Active IOs: %lld\nMaximum Active IOs: %lld\n"
228 "Number of IOs: %lld\nNumber of IO Completions: %lld\n"
229 "Number of IO Failures: %lld\nNumber of IO NOT Found: %lld\n"
230 "Number of Memory alloc Failures: %lld\n"
231 "Number of IOREQ Null: %lld\n"
232 "Number of SCSI cmd pointer Null: %lld\n",
233 (u64)atomic64_read(&stats->io_stats.active_ios),
234 (u64)atomic64_read(&stats->io_stats.max_active_ios),
235 (u64)atomic64_read(&stats->io_stats.num_ios),
236 (u64)atomic64_read(&stats->io_stats.io_completions),
237 (u64)atomic64_read(&stats->io_stats.io_failures),
238 (u64)atomic64_read(&stats->io_stats.io_not_found),
239 (u64)atomic64_read(&stats->io_stats.alloc_failures),
240 (u64)atomic64_read(&stats->io_stats.ioreq_null),
241 (u64)atomic64_read(&stats->io_stats.sc_null));
242
243 len += snprintf(debug->debug_buffer + len, buf_size - len,
244 "\n------------------------------------------\n"
245 "\t\tAbort Statistics\n"
246 "------------------------------------------\n");
247 len += snprintf(debug->debug_buffer + len, buf_size - len,
248 "Number of Aborts: %lld\n"
249 "Number of Abort Failures: %lld\n"
250 "Number of Abort Driver Timeouts: %lld\n"
251 "Number of Abort FW Timeouts: %lld\n"
252 "Number of Abort IO NOT Found: %lld\n",
253 (u64)atomic64_read(&stats->abts_stats.aborts),
254 (u64)atomic64_read(&stats->abts_stats.abort_failures),
255 (u64)atomic64_read(&stats->abts_stats.abort_drv_timeouts),
256 (u64)atomic64_read(&stats->abts_stats.abort_fw_timeouts),
257 (u64)atomic64_read(&stats->abts_stats.abort_io_not_found));
258
259 len += snprintf(debug->debug_buffer + len, buf_size - len,
260 "\n------------------------------------------\n"
261 "\t\tTerminate Statistics\n"
262 "------------------------------------------\n");
263 len += snprintf(debug->debug_buffer + len, buf_size - len,
264 "Number of Terminates: %lld\n"
265 "Maximum Terminates: %lld\n"
266 "Number of Terminate Driver Timeouts: %lld\n"
267 "Number of Terminate FW Timeouts: %lld\n"
268 "Number of Terminate IO NOT Found: %lld\n"
269 "Number of Terminate Failures: %lld\n",
270 (u64)atomic64_read(&stats->term_stats.terminates),
271 (u64)atomic64_read(&stats->term_stats.max_terminates),
272 (u64)atomic64_read(&stats->term_stats.terminate_drv_timeouts),
273 (u64)atomic64_read(&stats->term_stats.terminate_fw_timeouts),
274 (u64)atomic64_read(&stats->term_stats.terminate_io_not_found),
275 (u64)atomic64_read(&stats->term_stats.terminate_failures));
276
277 len += snprintf(debug->debug_buffer + len, buf_size - len,
278 "\n------------------------------------------\n"
279 "\t\tReset Statistics\n"
280 "------------------------------------------\n");
281
282 len += snprintf(debug->debug_buffer + len, buf_size - len,
283 "Number of Device Resets: %lld\n"
284 "Number of Device Reset Failures: %lld\n"
285 "Number of Device Reset Aborts: %lld\n"
286 "Number of Device Reset Timeouts: %lld\n"
287 "Number of Device Reset Terminates: %lld\n"
288 "Number of FW Resets: %lld\n"
289 "Number of FW Reset Completions: %lld\n"
290 "Number of FW Reset Failures: %lld\n"
291 "Number of Fnic Reset: %lld\n"
292 "Number of Fnic Reset Completions: %lld\n"
293 "Number of Fnic Reset Failures: %lld\n",
294 (u64)atomic64_read(&stats->reset_stats.device_resets),
295 (u64)atomic64_read(&stats->reset_stats.device_reset_failures),
296 (u64)atomic64_read(&stats->reset_stats.device_reset_aborts),
297 (u64)atomic64_read(&stats->reset_stats.device_reset_timeouts),
298 (u64)atomic64_read(
299 &stats->reset_stats.device_reset_terminates),
300 (u64)atomic64_read(&stats->reset_stats.fw_resets),
301 (u64)atomic64_read(&stats->reset_stats.fw_reset_completions),
302 (u64)atomic64_read(&stats->reset_stats.fw_reset_failures),
303 (u64)atomic64_read(&stats->reset_stats.fnic_resets),
304 (u64)atomic64_read(
305 &stats->reset_stats.fnic_reset_completions),
306 (u64)atomic64_read(&stats->reset_stats.fnic_reset_failures));
307
308 len += snprintf(debug->debug_buffer + len, buf_size - len,
309 "\n------------------------------------------\n"
310 "\t\tFirmware Statistics\n"
311 "------------------------------------------\n");
312
313 len += snprintf(debug->debug_buffer + len, buf_size - len,
314 "Number of Active FW Requests %lld\n"
315 "Maximum FW Requests: %lld\n"
316 "Number of FW out of resources: %lld\n"
317 "Number of FW IO errors: %lld\n",
318 (u64)atomic64_read(&stats->fw_stats.active_fw_reqs),
319 (u64)atomic64_read(&stats->fw_stats.max_fw_reqs),
320 (u64)atomic64_read(&stats->fw_stats.fw_out_of_resources),
321 (u64)atomic64_read(&stats->fw_stats.io_fw_errs));
322
323 len += snprintf(debug->debug_buffer + len, buf_size - len,
324 "\n------------------------------------------\n"
325 "\t\tVlan Discovery Statistics\n"
326 "------------------------------------------\n");
327
328 len += snprintf(debug->debug_buffer + len, buf_size - len,
329 "Number of Vlan Discovery Requests Sent %lld\n"
330 "Vlan Response Received with no FCF VLAN ID: %lld\n"
331 "No solicitations recvd after vlan set, expiry count: %lld\n"
332 "Flogi rejects count: %lld\n",
333 (u64)atomic64_read(&stats->vlan_stats.vlan_disc_reqs),
334 (u64)atomic64_read(&stats->vlan_stats.resp_withno_vlanID),
335 (u64)atomic64_read(&stats->vlan_stats.sol_expiry_count),
336 (u64)atomic64_read(&stats->vlan_stats.flogi_rejects));
337
338 len += snprintf(debug->debug_buffer + len, buf_size - len,
339 "\n------------------------------------------\n"
340 "\t\tOther Important Statistics\n"
341 "------------------------------------------\n");
342
343 jiffies_to_timespec(stats->misc_stats.last_isr_time, &val1);
344 jiffies_to_timespec(stats->misc_stats.last_ack_time, &val2);
345
346 len += snprintf(debug->debug_buffer + len, buf_size - len,
347 "Last ISR time: %llu (%8lu.%8lu)\n"
348 "Last ACK time: %llu (%8lu.%8lu)\n"
349 "Number of ISRs: %lld\n"
350 "Maximum CQ Entries: %lld\n"
351 "Number of ACK index out of range: %lld\n"
352 "Number of data count mismatch: %lld\n"
353 "Number of FCPIO Timeouts: %lld\n"
354 "Number of FCPIO Aborted: %lld\n"
355 "Number of SGL Invalid: %lld\n"
356 "Number of Copy WQ Alloc Failures for ABTs: %lld\n"
357 "Number of Copy WQ Alloc Failures for Device Reset: %lld\n"
358 "Number of Copy WQ Alloc Failures for IOs: %lld\n"
359 "Number of no icmnd itmf Completions: %lld\n"
360 "Number of QUEUE Fulls: %lld\n"
361 "Number of rport not ready: %lld\n"
362 "Number of receive frame errors: %lld\n",
363 (u64)stats->misc_stats.last_isr_time,
364 val1.tv_sec, val1.tv_nsec,
365 (u64)stats->misc_stats.last_ack_time,
366 val2.tv_sec, val2.tv_nsec,
367 (u64)atomic64_read(&stats->misc_stats.isr_count),
368 (u64)atomic64_read(&stats->misc_stats.max_cq_entries),
369 (u64)atomic64_read(&stats->misc_stats.ack_index_out_of_range),
370 (u64)atomic64_read(&stats->misc_stats.data_count_mismatch),
371 (u64)atomic64_read(&stats->misc_stats.fcpio_timeout),
372 (u64)atomic64_read(&stats->misc_stats.fcpio_aborted),
373 (u64)atomic64_read(&stats->misc_stats.sgl_invalid),
374 (u64)atomic64_read(
375 &stats->misc_stats.abts_cpwq_alloc_failures),
376 (u64)atomic64_read(
377 &stats->misc_stats.devrst_cpwq_alloc_failures),
378 (u64)atomic64_read(&stats->misc_stats.io_cpwq_alloc_failures),
379 (u64)atomic64_read(&stats->misc_stats.no_icmnd_itmf_cmpls),
380 (u64)atomic64_read(&stats->misc_stats.queue_fulls),
381 (u64)atomic64_read(&stats->misc_stats.rport_not_ready),
382 (u64)atomic64_read(&stats->misc_stats.frame_errors));
383
384 return len;
385
386}
387
4d7007b4
HP		 388/*
389 * fnic_trace_buf_init - Initialize fnic trace buffer logging facility
390 *
391 * Description:
392 * Initialize trace buffer data structure by allocating required memory and
393 * setting page_offset information for every trace entry by adding trace entry
394 * length to previous page_offset value.
395 */
396int fnic_trace_buf_init(void)
397{
398 unsigned long fnic_buf_head;
399 int i;
400 int err = 0;
401
402 trace_max_pages = fnic_trace_max_pages;
403 fnic_max_trace_entries = (trace_max_pages * PAGE_SIZE)/
404 FNIC_ENTRY_SIZE_BYTES;
405
406 fnic_trace_buf_p = (unsigned long)vmalloc((trace_max_pages * PAGE_SIZE));
407 if (!fnic_trace_buf_p) {
408 printk(KERN_ERR PFX "Failed to allocate memory "
409 "for fnic_trace_buf_p\n");
410 err = -ENOMEM;
411 goto err_fnic_trace_buf_init;
412 }
413 memset((void *)fnic_trace_buf_p, 0, (trace_max_pages * PAGE_SIZE));
414
415 fnic_trace_entries.page_offset = vmalloc(fnic_max_trace_entries *
416 sizeof(unsigned long));
417 if (!fnic_trace_entries.page_offset) {
418 printk(KERN_ERR PFX "Failed to allocate memory for"
419 " page_offset\n");
420 if (fnic_trace_buf_p) {
421 vfree((void *)fnic_trace_buf_p);
422 fnic_trace_buf_p = 0;
423 }
424 err = -ENOMEM;
425 goto err_fnic_trace_buf_init;
426 }
427 memset((void *)fnic_trace_entries.page_offset, 0,
428 (fnic_max_trace_entries * sizeof(unsigned long)));
429 fnic_trace_entries.wr_idx = fnic_trace_entries.rd_idx = 0;
430 fnic_buf_head = fnic_trace_buf_p;
431
432 /*
433 * Set page_offset field of fnic_trace_entries struct by
434 * calculating memory location for every trace entry using
435 * length of each trace entry
436 */
437 for (i = 0; i < fnic_max_trace_entries; i++) {
438 fnic_trace_entries.page_offset[i] = fnic_buf_head;
439 fnic_buf_head += FNIC_ENTRY_SIZE_BYTES;
440 }
441 err = fnic_trace_debugfs_init();
442 if (err < 0) {
abb14148 443 pr_err("fnic: Failed to initialize debugfs for tracing\n");
4d7007b4
HP		 444 goto err_fnic_trace_debugfs_init;
445 }
abb14148 446 pr_info("fnic: Successfully Initialized Trace Buffer\n");
4d7007b4
HP		 447 return err;
448err_fnic_trace_debugfs_init:
449 fnic_trace_free();
450err_fnic_trace_buf_init:
451 return err;
452}
453
454/*
455 * fnic_trace_free - Free memory of fnic trace data structures.
456 */
457void fnic_trace_free(void)
458{
459 fnic_tracing_enabled = 0;
460 fnic_trace_debugfs_terminate();
461 if (fnic_trace_entries.page_offset) {
462 vfree((void *)fnic_trace_entries.page_offset);
463 fnic_trace_entries.page_offset = NULL;
464 }
465 if (fnic_trace_buf_p) {
466 vfree((void *)fnic_trace_buf_p);
467 fnic_trace_buf_p = 0;
468 }
469 printk(KERN_INFO PFX "Successfully Freed Trace Buffer\n");
470}
abb14148
HS		 471
472/*
473 * fnic_fc_ctlr_trace_buf_init -
474 * Initialize trace buffer to log fnic control frames
475 * Description:
476 * Initialize trace buffer data structure by allocating
477 * required memory for trace data as well as for Indexes.
478 * Frame size is 256 bytes and
479 * memory is allocated for 1024 entries of 256 bytes.
480 * Page_offset(Index) is set to the address of trace entry
481 * and page_offset is initialized by adding frame size
482 * to the previous page_offset entry.
483 */
484
485int fnic_fc_trace_init(void)
486{
487 unsigned long fc_trace_buf_head;
488 int err = 0;
489 int i;
490
491 fc_trace_max_entries = (fnic_fc_trace_max_pages * PAGE_SIZE)/
492 FC_TRC_SIZE_BYTES;
493 fnic_fc_ctlr_trace_buf_p = (unsigned long)vmalloc(
494 fnic_fc_trace_max_pages * PAGE_SIZE);
495 if (!fnic_fc_ctlr_trace_buf_p) {
496 pr_err("fnic: Failed to allocate memory for "
497 "FC Control Trace Buf\n");
498 err = -ENOMEM;
499 goto err_fnic_fc_ctlr_trace_buf_init;
500 }
501
502 memset((void *)fnic_fc_ctlr_trace_buf_p, 0,
503 fnic_fc_trace_max_pages * PAGE_SIZE);
504
505 /* Allocate memory for page offset */
506 fc_trace_entries.page_offset = vmalloc(fc_trace_max_entries *
507 sizeof(unsigned long));
508 if (!fc_trace_entries.page_offset) {
509 pr_err("fnic:Failed to allocate memory for page_offset\n");
510 if (fnic_fc_ctlr_trace_buf_p) {
511 pr_err("fnic: Freeing FC Control Trace Buf\n");
512 vfree((void *)fnic_fc_ctlr_trace_buf_p);
513 fnic_fc_ctlr_trace_buf_p = 0;
514 }
515 err = -ENOMEM;
516 goto err_fnic_fc_ctlr_trace_buf_init;
517 }
518 memset((void *)fc_trace_entries.page_offset, 0,
519 (fc_trace_max_entries * sizeof(unsigned long)));
520
521 fc_trace_entries.rd_idx = fc_trace_entries.wr_idx = 0;
522 fc_trace_buf_head = fnic_fc_ctlr_trace_buf_p;
523
524 /*
525 * Set up fc_trace_entries.page_offset field with memory location
526 * for every trace entry
527 */
528 for (i = 0; i < fc_trace_max_entries; i++) {
529 fc_trace_entries.page_offset[i] = fc_trace_buf_head;
530 fc_trace_buf_head += FC_TRC_SIZE_BYTES;
531 }
532 err = fnic_fc_trace_debugfs_init();
533 if (err < 0) {
534 pr_err("fnic: Failed to initialize FC_CTLR tracing.\n");
535 goto err_fnic_fc_ctlr_trace_debugfs_init;
536 }
537 pr_info("fnic: Successfully Initialized FC_CTLR Trace Buffer\n");
538 return err;
539
540err_fnic_fc_ctlr_trace_debugfs_init:
541 fnic_fc_trace_free();
542err_fnic_fc_ctlr_trace_buf_init:
543 return err;
544}
545
546/*
547 * Fnic_fc_ctlr_trace_free - Free memory of fnic_fc_ctlr trace data structures.
548 */
549void fnic_fc_trace_free(void)
550{
551 fnic_fc_tracing_enabled = 0;
552 fnic_fc_trace_debugfs_terminate();
553 if (fc_trace_entries.page_offset) {
554 vfree((void *)fc_trace_entries.page_offset);
555 fc_trace_entries.page_offset = NULL;
556 }
557 if (fnic_fc_ctlr_trace_buf_p) {
558 vfree((void *)fnic_fc_ctlr_trace_buf_p);
559 fnic_fc_ctlr_trace_buf_p = 0;
560 }
561 pr_info("fnic:Successfully FC_CTLR Freed Trace Buffer\n");
562}
563
564/*
565 * fnic_fc_ctlr_set_trace_data:
566 * Maintain rd & wr idx accordingly and set data
567 * Passed parameters:
568 * host_no: host number accociated with fnic
569 * frame_type: send_frame, rece_frame or link event
570 * fc_frame: pointer to fc_frame
571 * frame_len: Length of the fc_frame
572 * Description:
573 * This routine will get next available wr_idx and
574 * copy all passed trace data to the buffer pointed by wr_idx
575 * and increment wr_idx. It will also make sure that we dont
576 * overwrite the entry which we are reading and also
577 * wrap around if we reach the maximum entries.
578 * Returned Value:
579 * It will return 0 for success or -1 for failure
580 */
581int fnic_fc_trace_set_data(u32 host_no, u8 frame_type,
582 char *frame, u32 fc_trc_frame_len)
583{
584 unsigned long flags;
585 struct fc_trace_hdr *fc_buf;
586 unsigned long eth_fcoe_hdr_len;
587 char *fc_trace;
588
589 if (fnic_fc_tracing_enabled == 0)
590 return 0;
591
592 spin_lock_irqsave(&fnic_fc_trace_lock, flags);
593
594 if (fnic_fc_trace_cleared == 1) {
595 fc_trace_entries.rd_idx = fc_trace_entries.wr_idx = 0;
1a84db56 596 pr_info("fnic: Resetting the read idx\n");
abb14148
HS		 597 memset((void *)fnic_fc_ctlr_trace_buf_p, 0,
598 fnic_fc_trace_max_pages * PAGE_SIZE);
599 fnic_fc_trace_cleared = 0;
600 }
601
602 fc_buf = (struct fc_trace_hdr *)
603 fc_trace_entries.page_offset[fc_trace_entries.wr_idx];
604
605 fc_trace_entries.wr_idx++;
606
607 if (fc_trace_entries.wr_idx >= fc_trace_max_entries)
608 fc_trace_entries.wr_idx = 0;
609
610 if (fc_trace_entries.wr_idx == fc_trace_entries.rd_idx) {
611 fc_trace_entries.rd_idx++;
612 if (fc_trace_entries.rd_idx >= fc_trace_max_entries)
613 fc_trace_entries.rd_idx = 0;
614 }
615
616 fc_buf->time_stamp = CURRENT_TIME;
617 fc_buf->host_no = host_no;
618 fc_buf->frame_type = frame_type;
619
620 fc_trace = (char *)FC_TRACE_ADDRESS(fc_buf);
621
622 /* During the receive path, we do not have eth hdr as well as fcoe hdr
623 * at trace entry point so we will stuff 0xff just to make it generic.
624 */
625 if (frame_type == FNIC_FC_RECV) {
626 eth_fcoe_hdr_len = sizeof(struct ethhdr) +
627 sizeof(struct fcoe_hdr);
abb14148
HS		 628 memset((char *)fc_trace, 0xff, eth_fcoe_hdr_len);
629 /* Copy the rest of data frame */
630 memcpy((char *)(fc_trace + eth_fcoe_hdr_len), (void *)frame,
631 min_t(u8, fc_trc_frame_len,
042b356a
HS		 632 (u8)(FC_TRC_SIZE_BYTES - FC_TRC_HEADER_SIZE
633 - eth_fcoe_hdr_len)));
abb14148
HS		 634 } else {
635 memcpy((char *)fc_trace, (void *)frame,
636 min_t(u8, fc_trc_frame_len,
637 (u8)(FC_TRC_SIZE_BYTES - FC_TRC_HEADER_SIZE)));
638 }
639
640 /* Store the actual received length */
641 fc_buf->frame_len = fc_trc_frame_len;
642
643 spin_unlock_irqrestore(&fnic_fc_trace_lock, flags);
644 return 0;
645}
646
647/*
648 * fnic_fc_ctlr_get_trace_data: Copy trace buffer to a memory file
649 * Passed parameter:
650 * @fnic_dbgfs_t: pointer to debugfs trace buffer
651 * rdata_flag: 1 => Unformated file
652 * 0 => formated file
653 * Description:
654 * This routine will copy the trace data to memory file with
655 * proper formatting and also copy to another memory
656 * file without formatting for further procesing.
657 * Retrun Value:
658 * Number of bytes that were dumped into fnic_dbgfs_t
659 */
660
661int fnic_fc_trace_get_data(fnic_dbgfs_t *fnic_dbgfs_prt, u8 rdata_flag)
662{
663 int rd_idx, wr_idx;
664 unsigned long flags;
665 int len = 0, j;
666 struct fc_trace_hdr *tdata;
667 char *fc_trace;
668
669 spin_lock_irqsave(&fnic_fc_trace_lock, flags);
670 if (fc_trace_entries.wr_idx == fc_trace_entries.rd_idx) {
671 spin_unlock_irqrestore(&fnic_fc_trace_lock, flags);
672 pr_info("fnic: Buffer is empty\n");
673 return 0;
674 }
675 rd_idx = fc_trace_entries.rd_idx;
676 wr_idx = fc_trace_entries.wr_idx;
677 if (rdata_flag == 0) {
678 len += snprintf(fnic_dbgfs_prt->buffer + len,
679 (fnic_fc_trace_max_pages * PAGE_SIZE * 3) - len,
680 "Time Stamp (UTC)\t\t"
681 "Host No: F Type: len: FCoE_FRAME:\n");
682 }
683
684 while (rd_idx != wr_idx) {
685 tdata = (struct fc_trace_hdr *)
686 fc_trace_entries.page_offset[rd_idx];
687 if (!tdata) {
688 pr_info("fnic: Rd data is NULL\n");
689 spin_unlock_irqrestore(&fnic_fc_trace_lock, flags);
690 return 0;
691 }
692 if (rdata_flag == 0) {
693 copy_and_format_trace_data(tdata,
694 fnic_dbgfs_prt, &len, rdata_flag);
695 } else {
696 fc_trace = (char *)tdata;
697 for (j = 0; j < FC_TRC_SIZE_BYTES; j++) {
698 len += snprintf(fnic_dbgfs_prt->buffer + len,
699 (fnic_fc_trace_max_pages * PAGE_SIZE * 3)
700 - len, "%02x", fc_trace[j] & 0xff);
701 } /* for loop */
702 len += snprintf(fnic_dbgfs_prt->buffer + len,
703 (fnic_fc_trace_max_pages * PAGE_SIZE * 3) - len,
704 "\n");
705 }
706 rd_idx++;
707 if (rd_idx > (fc_trace_max_entries - 1))
708 rd_idx = 0;
709 }
710
711 spin_unlock_irqrestore(&fnic_fc_trace_lock, flags);
712 return len;
713}
714
715/*
716 * copy_and_format_trace_data: Copy formatted data to char * buffer
717 * Passed Parameter:
718 * @fc_trace_hdr_t: pointer to trace data
719 * @fnic_dbgfs_t: pointer to debugfs trace buffer
720 * @orig_len: pointer to len
721 * rdata_flag: 0 => Formated file, 1 => Unformated file
722 * Description:
723 * This routine will format and copy the passed trace data
724 * for formated file or unformated file accordingly.
725 */
726
727void copy_and_format_trace_data(struct fc_trace_hdr *tdata,
728 fnic_dbgfs_t *fnic_dbgfs_prt, int *orig_len,
729 u8 rdata_flag)
730{
731 struct tm tm;
732 int j, i = 1, len;
733 char *fc_trace, *fmt;
734 int ethhdr_len = sizeof(struct ethhdr) - 1;
735 int fcoehdr_len = sizeof(struct fcoe_hdr);
736 int fchdr_len = sizeof(struct fc_frame_header);
737 int max_size = fnic_fc_trace_max_pages * PAGE_SIZE * 3;
738
739 tdata->frame_type = tdata->frame_type & 0x7F;
740
741 len = *orig_len;
742
743 time_to_tm(tdata->time_stamp.tv_sec, 0, &tm);
744
745 fmt = "%02d:%02d:%04ld %02d:%02d:%02d.%09lu ns%8x %c%8x\t";
746 len += snprintf(fnic_dbgfs_prt->buffer + len,
86001f24 747 max_size - len,
abb14148
HS		 748 fmt,
749 tm.tm_mon + 1, tm.tm_mday, tm.tm_year + 1900,
750 tm.tm_hour, tm.tm_min, tm.tm_sec,
751 tdata->time_stamp.tv_nsec, tdata->host_no,
752 tdata->frame_type, tdata->frame_len);
753
754 fc_trace = (char *)FC_TRACE_ADDRESS(tdata);
755
756 for (j = 0; j < min_t(u8, tdata->frame_len,
757 (u8)(FC_TRC_SIZE_BYTES - FC_TRC_HEADER_SIZE)); j++) {
758 if (tdata->frame_type == FNIC_FC_LE) {
759 len += snprintf(fnic_dbgfs_prt->buffer + len,
760 max_size - len, "%c", fc_trace[j]);
761 } else {
762 len += snprintf(fnic_dbgfs_prt->buffer + len,
763 max_size - len, "%02x", fc_trace[j] & 0xff);
764 len += snprintf(fnic_dbgfs_prt->buffer + len,
765 max_size - len, " ");
766 if (j == ethhdr_len ||
767 j == ethhdr_len + fcoehdr_len ||
768 j == ethhdr_len + fcoehdr_len + fchdr_len ||
769 (i > 3 && j%fchdr_len == 0)) {
770 len += snprintf(fnic_dbgfs_prt->buffer
86001f24 771 + len, max_size - len,
abb14148
HS		 772 "\n\t\t\t\t\t\t\t\t");
773 i++;
774 }
775 } /* end of else*/
776 } /* End of for loop*/
777 len += snprintf(fnic_dbgfs_prt->buffer + len,
778 max_size - len, "\n");
779 *orig_len = len;
780}
Linux kernel - Deliverables
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